Determine the number of neutrons in an atom of Si-29

Answers

Answer 1

Answer: 15 as 29 (atomic mass-number of neutrons and protons) - 14 (atomic number-number of protons)

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Use exponential notation to express the number 385,500 ha. one significant figure.
b. two significant figures.
c. three significant figures.
d. five significant figures.

Answers

To express the number 385,500 hours using exponential notation with a specific number of significant figures, you can use the following steps:

a. One significant figure:
- Expressing 385,500 as 3.9 × 10^5 hours (rounded to one significant figure).

b. Two significant figures:
- Expressing 385,500 as 3.9 × 10^5 hours (rounded to two significant figures).

c. Three significant figures:
- Expressing 385,500 as 3.86 × 10^5 hours (rounded to three significant figures).

d. Five significant figures:
- Expressing 385,500 as 3.8550 × 10^5 hours (rounded to five significant figures).

Keep in mind that the exponential notation represents the same value but with the specified number of significant figures.

Elements in Group 17 form which ion?
A. 1
B. +1
C. -1
D. 0

Answers

Answer:

Elements in group 17 form C. -1 ions

It would b C. -1
hope this helps

Chemical bonds are likely to form when _____.an atom’s nucleus has the same number of protons as it does neutrons

two atoms have the same number of electrons

an atom’s outer energy level is filled to capacity

an atom’s outer energy level doesn’t have the maximum number of electrons

Answers

Answer:

The answer to your question is the last option

Explanation:

an atom’s nucleus has the same number of protons as it does neutrons to have the same number of protons and neutrons does not affect the ability of an atom to form bonds, so this option is wrong.

two atoms have the same number of electrons some atoms have that have the same number of electrons can form bonds, but most of the atoms that form bonds do not have the same number of electrons. This option is wrong.

an atom’s outer energy level is filled to capacity this option is wrong because noble gases have the outermost energy level filled to capacity and are unreactive.

an atom’s outer energy level doesn’t have the maximum number of electrons an atom with the characteristics described are reactive, so this is the correct answer.

A scientist can explain how the brain recognizes odors.
True
False

Answers

True, that's because of the receptors one have got to sense the changes in the environment .

Rob measures the solubility of three different salts in water at 22°C. Which type of graph should he use to display his data? bar graph line graph histogram scatterplot

Answers

The best graph Rob can use to show his data is a scatter plot. A scatter plot shows a relationship between two sets of data in this case the solids and their respective solubility. A scatter plot is very specific in showing how one variable is affected by another variable.

Answer:

bar graph

Explanation:

hope it helps

All silicate minerals must contain atoms of which of these elements? select all that apply.a. carbon
b. silicon
c. oxygen
d. hydrogen

Answers

All silicate minerals must contain atoms of b.silicon and c. oxygen. These are largely rock minerals that comprise approximately 90 percent of the crust of the Earth. The minerals vary in the composition and structure or ratio of silicon and oxygen.

Answer:

Silicon and oxygen

Explanation:

All silicate minerals must contain silicon and oxygen even though the name might mislead one into thinking it is only just silicon. Actually the suffix -ate in chemistry is used when an element is combined with oxygen. Which is why the carbonate ion has carbon and oxygen, the nitrate ion has nitrogen and oxygenThis repeats itself in the sulphate ion, phosphate ion, chromate ion, manganate ion etc.

Other Questions

Which is the element with the highest electronegativity value?A)cesium B)helium C)calcium D) fluorine

The _______ elements tend to lose electrons and form positive ions, while the _______ elements tend to gain electrons and form negative ions. A. Nonmetal, metal B. Metal, noble gas C. Metal, nonmetal D. Noble gas, nonmetal

Consider the dissolution of 2.50 grams of salt XY in 75.0 mL of water within a calorimeter. The temperature of the water decreased by 0.93 oC. The heat capacity of the calorimeter is 42.2 J/oC. The density of the water (and the solution) is 1.00 g/mL. The specific heat capacity of the solution is 4.184 J/goC. Calculate the enthalpy change for dissolving this salt on a energy per mass basis (units of J/g).

In which compound is the percent compositionby mass of chlorine equal to 42%?(1) HClO (gram-formula mass = 52 g/mol)(2) HClO2 (gram-formula mass = 68 g/mol)(3) HClO3 (gram-formula mass = 84 g/mol)(4) HClO4 (gram-formula mass = 100. g/mol)